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[share] Image Stack Background for Text

To add background color for text on Image Stack Block, just add this code to Home > Design > Custom CSS

div#block-yui_3_17_2_1_1592922946230_6106 figure {
background: red;
}

Replace div#block...6106 with Image Block ID.

Find ID with this tool https://chrome.google.com/webstore/detail/squarespace-collectionblo/bggpdfnccodbnmcndckmeehdjkjojkde